cpp-json/test/json_binder_tuple.t.h

//
//  json_binder_tuple.t.h
//  json
//
//  Created by Sam Jaffe on 2/26/17.
//

#pragma once

#include <cxxtest/TestSuite.h>
#include "json/json_binder.hpp"

using namespace json::binder;
using namespace json::parser;

struct point { int x; int y; };
bool operator==(point const & lhs, point const & rhs) {
  return lhs.x == rhs.x && lhs.y == rhs.y;
}

class json_binder_tuple_TestSuite : public CxxTest::TestSuite {
public:
  void test_bind_to_tuple() {
    char data[] = "[ 1, 2 ]";
    using tuple = std::tuple<int, int>;
    tuple out = std::make_tuple(0, 0);
    auto binder = make_default_tuple_binder<int, int>();
    parse(json::binder::bind(out, binder), data, allow_all);
    TS_ASSERT_EQUALS(out, std::make_tuple(1, 2));
  }
  
  void test_bind_to_tuple_throws_if_missing_entry() {
    char data[] = "[ 1 ]";
    using tuple = std::tuple<int, int>;
    tuple out = std::make_tuple(0, 0);
    auto binder = make_default_tuple_binder<int, int>();
    TS_ASSERT_THROWS(parse(json::binder::bind(out, binder), data, allow_all),
                     json::malformed_json_exception);
  }

  void test_bind_to_tuple_throws_if_too_many_entries() {
    char data[] = "[ 1, 2, 3 ]";
    using tuple = std::tuple<int, int>;
    tuple out = std::make_tuple(0, 0);
    auto binder = make_default_tuple_binder<int, int>();
    TS_ASSERT_THROWS(parse(json::binder::bind(out, binder), data, allow_all),
                     json::malformed_json_exception);
  }
  
  void test_bind_to_tuple_throws_if_unterminated() {
    char data[] = "[ 1, 2 ";
    using tuple = std::tuple<int, int>;
    tuple out = std::make_tuple(0, 0);
    auto binder = make_default_tuple_binder<int, int>();
    TS_ASSERT_THROWS(parse(json::binder::bind(out, binder), data, allow_all),
                     json::unterminated_json_exception);
  }
  
  void test_bind_to_tuple_throws_if_unstarted() {
    char data[] = "1, 2 ]";
    using tuple = std::tuple<int, int>;
    tuple out = std::make_tuple(0, 0);
    auto binder = make_default_tuple_binder<int, int>();
    TS_ASSERT_THROWS(parse(json::binder::bind(out, binder), data, allow_all),
                     json::malformed_json_exception);
  }
  
  void test_bind_to_tuple_with_multiple_types() {
    char data[] = "[ 1, 0.5, \"hello\" ]";
    using tuple = std::tuple<int, double, std::string>;
    tuple out = std::make_tuple(0, 0.0, "");
    auto binder = make_default_tuple_binder<int, double, std::string>();
    TS_ASSERT_THROWS_NOTHING(parse(json::binder::bind(out, binder), data, allow_all));
    TS_ASSERT_EQUALS(out, std::make_tuple(1, 0.5, "hello"));
  }
  
  void test_write_tuple() {
    std::string expected = "[1,\"word\"]";
    std::stringstream ss;
    using tuple = std::tuple<int, std::string>;
    tuple const in = std::make_tuple(1, "word");
    auto binder = make_default_tuple_binder<int, std::string>();
    write(json::binder::bind(in, binder), ss);
    TS_ASSERT_EQUALS(ss.str(), expected);
  }
  
  void test_parse_struct_tuple_binding() {
    char data[] = "[ 10, 5 ]";
    point out{0, 0};
    auto binder = tuple_binder<point>()(&point::x)(&point::y);
    TS_ASSERT_THROWS_NOTHING(parse(json::binder::bind(out, binder), data, allow_all));
    TS_ASSERT_EQUALS(out, (point{10, 5}));
  }
  
  void test_write_struct_tuple_binding() {
    std::string const expected = "[10,5]";
    std::stringstream ss;
    point const in{10, 5};
    auto binder = tuple_binder<point>()(&point::x)(&point::y);
    TS_ASSERT_THROWS_NOTHING(write(json::binder::bind(in, binder), ss));
    TS_ASSERT_EQUALS(ss.str(), expected);
  }
};